Hacksaw-machine.



F. S. BRADLEY.

HAGKSAW MACHINE.

APPLICATION FILED APR. 1, 1910.

Patented Au 23, 1910.

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P. S. BRADLEY;

HAGKSAW MAGHINE.

APPLIQATION FILED APR. 1, 1910.

Patented Aug. 23, 1910.

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FRANK S. BRADLEY, OF WEST HAVEN, CONNECTICUT.

HACKSAW-MAOHINE.

Specification of Letters Patent.

Patented Aug. 23, 1910.

Application filed April 1, 1910. Serial No. 552,838.

To all whom it may concern:

Be it known that I, FRANK S. BRADLEY, citizen of the United States, residing at West Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Hacksaw-Machines; and I do, hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to hack saw machines and it consists of certain improvements to be more fully set forth in the following specification.

Referring to the drawings: Figure 1 represents an upper plan view of the machine; Fig. 2 a front side elevation; Fig. 3 is an enlarged rear broken side elevation of the bed of the machine, saw frame and saw, overhead saw supporting bar, and trip rod showing saw frame in an elevated position; Fig. 4 is an enlarged detail view of the clutch sleeves and their support, and broken view of driving pulley integral with one of the sleeves; Fig. 5 is an enlarged broken sectional view of the bed, cross section of the starting lever, detail view of the pivoted starting lever support and broken view of the curved arm of the saw frame tilting lever; Fig. 6 is an enlarged broken sectional view of the clutch lever on line a-a of Fig. 7, and broken view of the curved arm of the saw frame tilting lever adapted to engage therewith; Fig. 7 is an enlarged detail view of the clutch lever; and Fig. 8 is a broken view of the large gear for actuating the saw frame and cam for tilting the same, and broken view of the lever connected with the tilting mechanism.

The standards 1 and 2 project from and are integral with the bed 3, and they serve as a support for the non-rotatable rod or shaft 4 on which rod the clutch sleeves 5 and 6 are journaled. The sleeve 5, Fig. 4, has the teeth 5 on its inner face and the pulley 7 is integral with said sleeve. The sleeve 6 is also provided with the teeth 6 to engage with the teeth of the sleeve 5, as will be hereinafter explained. Secured to the sleeve 6 is the pinion 8 adapted to mesh with the large gear 9, Figs. 1 and 2, journaled on the non-rotatable rod 10, which rod is removably secured in the double sided standard 11.

Located between the sides of the standard 11 and journaled on the rod 10 is the saw frame supporting lever 12 (see also Fig. 3) whose outer end is secured to the long bar 13 carrying the saw frame 14 at one end and the adjustable balance weight 15 at the other end. The saw frame is slidably 'mounted on said bar and all vertical wear is readily taken up by the cap 16 and its screws 17, while the side play and wear is taken up by the gib screws 18.

19 is a rocker arm pivotally supported at its lower end on the pin 20 of the standard 21, seen more clearly at Fig. 2. The upper end of this arm is pivotally connected to one end of the connecting rod 22, while the other end of said rod is pivotally connected to the rear end of the saw-frame. 23 is a crank pin secured to one of the arms of the gear 9 andit carries the roll 24 located in the elongated slot 25 of the arm 19 so that, when the gear 9 is rotating, the upper end of said arm will travel through a circular arc and cause a longitudinal reciprocatory movement of the saw-frame on the bar 13.

26 is the starting lever whose inner end is journaled on the rod 4. and is provided with the cam face 26 adapted to engage with the cam face 27 of the outer end of the sleeve 5 so that when said lever is raised, the engagement of these cam faces will move the pulley sleeve 5 toward the pinion sleeve 6 and bring their clutch faces together to start the machine. The said cam faces will also disengage the clutch faces when the starting lever is dropped.

28 is a pivotal support for the starting lever whose normal position, when the machine is stopped, is resting (Fig. 5) on the toe 28 of the said support, and when the machine is in operation said lever will rest onthe top of said support. 29 is a spring under the opposite toe 28 which will normally incline the support in the direction of arrow Z) with the toe 28 resting on the bed 3 so that when the starting lever is raised it will rest, as before mentioned, on the top of the support, and from which position it will be automatically displaced in the manner to be hereinafter described.

The saw frame supporting lever 12 is secured to the overhead bar 13 at two points by the screws 30 and 31 in order to effect a rigid connection between the two elements. This lever is provided with the radial arm 12 which passes through the opening 32, Figs. 6 and 7, of the clutch lever 33. This frame has reached lever carries the adjusting fulcrum screw 34 whose point rests on the standard 35. The opposite end of this clutch lever is pivotally connected to one end of the link 36' whose opposite end is pivotally connected to the outer end of the lever 37 pivotally supported in the standard 38. The inner end, Fig. 8, of this lever carries the roll 39 adapted to be engaged by the cam 40 secured to the hub of the gear 9, and 39 is a spring adapted to maintain such engagement. When work to be operated on by the saw 41 is being placed in the work holding vise comprising the stationary jaw 42 and the movable jaw 43,

which latter is actuated in the usual manner by the threaded rod 44 and its handle 45, the saw frame is in an elevated position shown at Fig. 3, and is automatically maintained in such position by means of the depending trip rod 46 pivotally supported on the lever 12. The lower end of this trip rod will rest on top of the standard 35 and will be thrown into such position by the spring 47, Fig. 2, mounted on the horizontal rod 48 whose inner end is connected to the upper end of the trip rod 46.

WVhen the machine is ready for the operation of sawing, the rod 48 is moved inward to disengage the trip rod from its resting place on the top of the standard 35 and thus permit the saw being brought down on to the work (not shown) that has been placed in the work holding vise. The. starting lever is then raised to rest on the top of the tilting'support 28 to start the machine as before mentioned. To prevent the teeth of the saw blade dragging on the work on its return stroke, it is slightly lifted on such return stroke through the medium of the before described cam 40, roll 38, connecting rod 37 and the clutch lever 33, as follows: The opening 32 in said clutch lever is just large enough to freely admit the curved arm 12 when said lever is in approximately a horizontal position so that when the saw its extreme forward stroke the cam 40 will depress the inner end of the connecting rod 37 and elevate its outer end sufliciently to cause the clutch lever to grip the said curved arm and give an upward tilt to the lever 12 and thus raise the saw blade slightly to avoid the backward drag of the teeth on the work. As soon as the extreme backward or return stroke of the saw has been reached, the cam 40 will have passed by the roll 39 and the grip of the clutch lever will then be released and the saw will be at liberty to engage the work on its forward stroke.

The feeding of the saw through the work is by gravity, in other words, the weight of material forward of the pivotal point, as represented by the bearing 10, will give the necessary cutting pressure, regulated, of course, by the adjustable weight 15. The alternate downward feed on the forward stroke, and the temporary lift of the saw frame on its return stroke will automatically continue until the saw has passed through the work. As soon as this takes place, the end of the curved arm 12 will contact with the toe 28 of the pivotal support 28 and tilt said su port in the direction of arrow 0, Fig. 5, to islodge the starting lever 26 and stop the machine.

From the foregoing it will be observed that the machine is constructed not only for the efficiency of its work, but also to enhance its wearing qualities. As the rotatable parts are all mounted on stationary shafts or rods, no extra mechanism is required to rotate the shafts and therefore the machine can be made narrower and more compact and of fewer parts than is usually employed in machines of this character.

Having thus described my invention, what I claim is 1. A hack saw machine comprising a bed having standards risin therefrom, rods mounted in said standards and arallel with each other, clutch sleeves rotata ly mounted on one of said rods, means for bringing said sleeves into driving engagement with each other and disengaging the same, a pulley integral with one sleeve and a pinion mounted on the other sleeve, a gear rotatably mounted on the other rod and meshing with said pinion, a rocker arm pivotally supported on the bed and having an elongated slot, a roll mounted on the gear to work in said slot, a saw frame pivotally connected to the rocker arm, an overhead bar on which said saw frame is slidably mounted, a supporting lever for said bar, said lever journaled on the gear supporting rod, and means for actuating said bar supporting lever to raise the same and prevent the backward drag of the saw on the work.

2. In a machine of the character described, a reciprocating saw frame and its driving and actuating mechanism, a bar on which said saw frame is slidably mounted, a tilting lever supporting the bar and having a curved arm projecting therefrom, a fulcrumed clutch lever embracing said arm, a pivotally supported lever connected at one end to the clutch lever, a cam adapted to engage with the opposite end of said lever and thus actuate the clutch lever to raise the saw frame bar supporting lever on the backward stroke of the saw frame, a starting lever connected with the driving mechanism, a tilting support for said starting lever, said curved arm adapted to actuate said tilted support and dislodge the starting lever and stop the machine when the saw has completed its work.

3. A hack saw machine comprising two stationary supports arranged parallel with each other, clutch sleeves rotatably mounted on one of said supports, means for engaging connecting rod for pivotally connecting said 10 and disengaging said clutch sleeves, one of rocker arm with the saw frame.

said sleeves carrying a pulley and the other In testimony whereof I aflix my signature a pinion, a gear rotatably mounted on the in presence of two Witnesses.

other support and meshing with said pinion,

a saw frame, a su port on which the saw is FRANK BRADLEY slidably mounted a pivotally supported rocker arm, means on the gear adapted to engage with and actuate said arm, and a WVitnesses:

OSWALD B. GRAHAM, EDNA M. FAUREs. 

